BPSK Modulation-Based Local Oscillator-Free IQ Demodulation for Millimeter Wave Imaging

The precision of local oscillator (LO) signal in in-phase and quadrature (IQ) demodulation strongly affects the imaging performance of millimeter wave (mmWave) radars. Therefore, to eliminate the requirement for high-precision LO, a simple yet effective digital IQ demodulation method has been propos...

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Autores principales:	Qibin Zheng, Yanpeng Jian, Lei Wang, Ziyue Ma, Xinyu Li, Chaofan Song, Ping Li, Li Ding
Formato:	article
Lenguaje:	EN
Publicado:	Hindawi Limited 2021
Materias:	Technology (General) T1-995
Acceso en línea:	https://doaj.org/article/6320904f1a71424fae491166fb39e6f6
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spelling	oai:doaj.org-article:6320904f1a71424fae491166fb39e6f62021-11-15T01:20:00ZBPSK Modulation-Based Local Oscillator-Free IQ Demodulation for Millimeter Wave Imaging1687-726810.1155/2021/5596854https://doaj.org/article/6320904f1a71424fae491166fb39e6f62021-01-01T00:00:00Zhttp://dx.doi.org/10.1155/2021/5596854https://doaj.org/toc/1687-7268The precision of local oscillator (LO) signal in in-phase and quadrature (IQ) demodulation strongly affects the imaging performance of millimeter wave (mmWave) radars. Therefore, to eliminate the requirement for high-precision LO, a simple yet effective digital IQ demodulation method has been proposed with the aid of a specified sampling scheme in order to eliminate the demand for LO. Based on the bandpass sampling theorem, the characteristic of the intermediate frequency signal of mmWave imaging indicates that the LO is unrequired if the sampling rate is twice of the frequency of the carrier of the intermediate signal. In this way, the in-phase signal would be directly and accurately obtained by performing the Binary-Phase-Shift-Keying (BPSK) modulation on the samples, based on which the IQ demodulation would be completed by using the Hilbert transform. The proposed method does not employ LO and thus simplifies the demodulation process and is suitable for implementation in a Field-Programmable Gate Array (FPGA) with fewer hardware resources. To verify the method, a three-dimensional mmWave radar imaging is carried out at the 30-34 GHz bandwidth, where the sampling and digital IQ demodulation are realized by an ADC (AD9250) and FPGA (XC7K325T), respectively. The results show a simplified transceiver with lower requirements and the prospect of the proposed method being applied in radar imaging and other related fields.Qibin ZhengYanpeng JianLei WangZiyue MaXinyu LiChaofan SongPing LiLi DingHindawi LimitedarticleTechnology (General)T1-995ENJournal of Sensors, Vol 2021 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Technology (General) T1-995
spellingShingle	Technology (General) T1-995 Qibin Zheng Yanpeng Jian Lei Wang Ziyue Ma Xinyu Li Chaofan Song Ping Li Li Ding BPSK Modulation-Based Local Oscillator-Free IQ Demodulation for Millimeter Wave Imaging
description	The precision of local oscillator (LO) signal in in-phase and quadrature (IQ) demodulation strongly affects the imaging performance of millimeter wave (mmWave) radars. Therefore, to eliminate the requirement for high-precision LO, a simple yet effective digital IQ demodulation method has been proposed with the aid of a specified sampling scheme in order to eliminate the demand for LO. Based on the bandpass sampling theorem, the characteristic of the intermediate frequency signal of mmWave imaging indicates that the LO is unrequired if the sampling rate is twice of the frequency of the carrier of the intermediate signal. In this way, the in-phase signal would be directly and accurately obtained by performing the Binary-Phase-Shift-Keying (BPSK) modulation on the samples, based on which the IQ demodulation would be completed by using the Hilbert transform. The proposed method does not employ LO and thus simplifies the demodulation process and is suitable for implementation in a Field-Programmable Gate Array (FPGA) with fewer hardware resources. To verify the method, a three-dimensional mmWave radar imaging is carried out at the 30-34 GHz bandwidth, where the sampling and digital IQ demodulation are realized by an ADC (AD9250) and FPGA (XC7K325T), respectively. The results show a simplified transceiver with lower requirements and the prospect of the proposed method being applied in radar imaging and other related fields.
format	article
author	Qibin Zheng Yanpeng Jian Lei Wang Ziyue Ma Xinyu Li Chaofan Song Ping Li Li Ding
author_facet	Qibin Zheng Yanpeng Jian Lei Wang Ziyue Ma Xinyu Li Chaofan Song Ping Li Li Ding
author_sort	Qibin Zheng
title	BPSK Modulation-Based Local Oscillator-Free IQ Demodulation for Millimeter Wave Imaging
title_short	BPSK Modulation-Based Local Oscillator-Free IQ Demodulation for Millimeter Wave Imaging
title_full	BPSK Modulation-Based Local Oscillator-Free IQ Demodulation for Millimeter Wave Imaging
title_fullStr	BPSK Modulation-Based Local Oscillator-Free IQ Demodulation for Millimeter Wave Imaging
title_full_unstemmed	BPSK Modulation-Based Local Oscillator-Free IQ Demodulation for Millimeter Wave Imaging
title_sort	bpsk modulation-based local oscillator-free iq demodulation for millimeter wave imaging
publisher	Hindawi Limited
publishDate	2021
url	https://doaj.org/article/6320904f1a71424fae491166fb39e6f6
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BPSK Modulation-Based Local Oscillator-Free IQ Demodulation for Millimeter Wave Imaging

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